Perfusion Magnetic Resonance Imaging in Diagnosing Patients With Kidney Tumors

Inclusion Criteria: * Patients must be able to read, understand, and voluntarily sign an informed consent document * For patients with organ confined renal tumors to be enrolled, the renal mass must be \>= 1 cm in diameter on computed tomography (CT) or magnetic resonance imaging (MRI) and can be any clinical stage T1a-T4 (non-metastatic); a histologic diagnosis is not required for enrollment; the primary imaging site would be kidney * For patients with metastatic renal tumors to be enrolled, a histologic diagnosis of renal cell carcinoma must exist and any burden of disease \>= 1 cm by CT or MRI is acceptable; the metastatic sites may be kidney, intra-abdominal (such as liver), brain, bone, or lymph nodes; lung lesions are NOT eligible because of the motion artifact caused by respiration * Patients with metastatic disease may have received prior nephrectomy and/or prior systemic therapy (no limit on number); their baseline pMRI would be performed prior to starting a new treatment * Negative pregnancy test if female of child-bearing age * Able to undergo contrast enhanced MRI Exclusion Criteria: * Severe concurrent disease, infection, or medical co-morbidity that, in the judgment of the investigator, would make the patient inappropriate for enrollment * Severe renal function impairment (estimated glomerular filtration rate \[eGFR\] \< 45 mL/min/1.73 m\^2) would make the patient inappropriate for enrollment due to the increased risk of nephrogenic systemic fibrosis (NSF) wi…